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Number of Tubes in a Lot Heat Treated by the Continuous Process or by Direct Quench After Hot Forming
|
Size of Tube
|
Size of Lot
|
|
2 in. [50 mm] and over in outside diameter
and 0.200 in.[5.08 mm] and over
in wall thickness
|
not more than 50
tubes
|
|
Less than 2 in. [50 mm] but over
1 in. [25 mm] in outside diameter
or over 1 in. [25 mm] in outside
diameter and under 0.200 in. [5.08 mm]
in wall thickness
|
not more than 75
tubes
|
|
1 in. [25 mm] or less in outside diameter
|
not more than 125
tubes
|
Permissible Variations in Dimensions
|
Group
|
Size, Outside
Diameter, in. [mm]
|
Permissible
Variations in
Outside Diameter,
in. (mm)
|
Permissible
Variations in
Wall
Thickness,A
%
|
Permissible Variations in
Cut
Length,
in. [mm]B
|
Thin Walled TubesC
|
|
|
Over
|
Under
|
|||||
| 1 |
Up to 1⁄2 [13]
|
±0.005 [0.13]
|
±15
|
1⁄8 [3.2]
|
0 | ... |
| 2 |
1⁄2 to 1 1⁄2
[13 to 38], excl
|
±0.005 [0.13]
|
±10
|
1⁄8 [3.2]
|
0 |
less than 0.065 in. [1.65 mm] nominal
|
| 3 |
1 1⁄2 to 3 1⁄2
[38 to 89], excl
|
±0.010 [0.25]
|
±10
|
3⁄16 [4.8]
|
0 |
less than 0.095 in. [2.41 mm] nominal
|
| 4 |
3 1⁄2 to 5 1⁄2
[89 to 140], excl
|
±0.015 [0.38]
|
±10
|
3⁄16 [4.8]
|
0 |
less than 0.150 in. [3.81 mm] nominal
|
| 5 |
5 1⁄2 to 8
[140 to 203], excl
|
±0.030 [0.76]
|
±10
|
3⁄16 [4.8]
|
0 |
less than 0.150 in. [3.81 mm] nominal
|
| 6 |
8 to 12
[203 to 305], excl
|
±0.040 [1.01]
|
±10
|
3⁄16 [4.8] | 0 |
less than 0.200 in. [5.08 mm] nominal
|
| 7 |
12 to 14 [305 to 356], excl
|
±0.050 [1.26]
|
±10
|
3⁄16 [4.8] | 0 |
less than 0.220 in. [5.59 mm] nominal
|
AWhen tubes as ordered require wall thicknesses 3⁄4 in. [19.0 mm] or over, or an inside diameter 60 % or less of the outside diameter, a wider variation in wall thickness is required. On such sizes a variation in wall thickness of 12.5 % over or under will be permitted.For tubes less than 1⁄2 in. [12.7 mm] in inside diameter which cannot be successfully drawn over a mandrel, the wall thickness may vary ±15 % from that specified.
Heat Treatment
1.All material shall be furnished in the solution heattreated condition. Except as provided in 6.2, the heat-treatment procedure shall consist of heating the material to a minimum temperature or temperature range as specified for the grade in Table 2, followed by quenching in water or rapidly cooling by
3.
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